From Canada Post’s Details magazine:
NATIONAL RESEARCH COUNCIL OF CANADA Commemorative envelopeIssue date: June 6th

We honour the 100th anniversary of the National Research Council of Canada (NRC) by showcasing some of the many cutting-edge Canadian inventions it has fostered over the past century. From advances in early aviation safety and nuclear medicine to vaccines and space-based engineering, they represent NRC’s dedication to the science and innovation that builds new industry, enhances national security, and improves the well-being of Canadians